Chemistry & ProductsQuestion 301 of 484
When an alkaline product such as ammonia is applied to the hair, the cuticle layer:
a.Closes tightly to seal in moisture
b.Becomes electrically charged but does not move
c.Detaches completely from the cortex
d.Swells and lifts open, allowing chemicals to enter the cortex
Explanation
Alkaline solutions (pH above the natural 4.5 to 5.5 range) swell the hair shaft and lift the imbricated cuticle scales. The raised cuticle is what allows oxidative color, lighteners, and waving solutions to reach the cortex.
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